The XTerm program is the standard terminal emulator for the X Window System. It
provides DEC VT102/VT220 and Tektronix 4014 compatible terminals for programs
that can't use the window system directly. If the underlying operating system
supports terminal resizing capabilities (for example, the SIGWINCH signal in
systems derived from 4.3bsd), xterm will use the facilities to notify programs
running in the window whenever it is resized.